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Resolving the environment variable from a file

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# 1  
Old 02-01-2013
Resolving the environment variable from a file
Hi,

I an having some environment variables exported and the variable name is present in the file. But its not resolving with following commands. Can someone throw some light.
Code:
db $ grep -v "^#" TD_FWK_NUCLEUS.dbc | grep -v "^$" | xargs -i echo {}
wb_bin: ${TD_FWK_NUCLEUS_DBC_WB_BIN_TAG}

I wanted the value instead of the variable name.

Expected output :
Code:
db $ echo "wb_bin: ${TD_FWK_NUCLEUS_DBC_WB_BIN_TAG}"
wb_bin: /opt/teradata/client/13.0/tbuild/bin

Last edited by Franklin52; 02-01-2013 at 07:03 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 02-01-2013
The way you asked the question is quite confusing.
Could you please clarify ?

What is the name of your script ?
what is the content of your script ?

Maybe you can give a try to this :
Code:
egrep -ve "^#|^$" TD_FWK_NUCLEUS.dbc | while read line;do eval echo "$line";done

I don't know exactly what you are trying to achieve, but I suspect your approach could be enhanced a lot.
Last edited by ctsgnb; 02-01-2013 at 07:07 AM..
# 3  
Old 02-01-2013
Many thanks, Its working with while.

Its not a script. It was a txt file in which the variable names are there which is environment variables. Tried to get the values; but could not with echo. while is working fine,.
# 4  
Old 02-01-2013
To load a file that contains environnement variable settings use the <dot><space><filename> notation.

Code:
. /home/your_env_file

Or if you are in c-shell (which should be avoid if possible)

Code:
source /home/your_env_file

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